zink: make implicit feedback loop application stricter

zink: make implicit feedback loop application stricter

in many cases, a texture may be bound as both a framebuffer attachment
and a samplerview without the latter actually being used by a shader

this avoids unnecessary feedback loop tagging, which should improve
perf and avoid spurious warning messages on drivers that don't support
the feedback loop ext

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20674>